What the ratings mean on the bench
The P6KE170CA-T: The 145 V reverse standoff means it sits across a 145 V DC rail without conducting leakage; when a transient exceeds 162 V (the breakdown minimum), the device clamps at 234 V max, shunting up to 2.6 A of surge current through the DO-15 body. The bidirectional channel means you can install it without worrying about polarity — handy on AC lines or where the surge polarity is unknown.
Diodes Incorporated lists the P6KE170CA-T as obsolete. The P6KE series is a mature TVS family, and the DO-15 axial footprint is common across multiple manufacturers. If a board spin is not an option, sourcing through independent distribution is the realistic path; we can quote against your required quantity and verify date codes and traceability at quote time.